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Sipforum SIP & IPv6 discussion slides
Session Initiation Protocol (SIP) Chapter 5 speaker ： Wenping Zhang data ： 2007.11.8.
Session Initiation Protocol (SIP) Chapter 5. Internet Telephony 2 Introduction A powerful alternative to H.323 More flexible, simpler Easier to implement.
Session Initiation Protocol (SIP) Ram Dantu (Compiled from different sources, see the references list)
